* parse.y (parser_number_literal_suffix): return bit set of found
  suffixes.
* parse.y (parser_set_number_literal, parser_set_integer_literal):
  split from parser_number_literal_suffix to set yyvlal.
* parse.y (parser_yylex): parse rational number literal with decimal
  point precisely.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42332 b2dd03c8-39d4-4d8f-98ff-823fe69b080e